Steklo i Keramika (Glass and Ceramics). Monthly scientific, technical and industrial journal
ISSN 0131-9582 (Online)
ISSN 0131-9582 (Online)
The purpose of this work was developing of protective technological coating for protection of heat-resistant nickel alloy with single-crystal structure ZHS30 during high-temperature homogenization. Based on characteristics of the alloy the synthesis of coatings was carried out in following directions: modification of known coatings in the system CaO–BaO–SiO2 by introducting refractory filler and organosilicon materials, research of two-layer coatings and synthesis of refractory frits in various silicate systems.
The best properties of alloy ZHS30 are obtained using a coating based on a synthesized frit containing SiO2, B2O3, BaO, ZrO2. High efficiency of the protective action of the coating is ensured by the chemical composition of the frit which leads to the formation of structural groups [BO4] in the glass that participate in the formation of the glass lattice. Zirconium ions also participate in the construction of the structure and together with silicon and boron ions form a single boron-zirconium-silicon-oxygen framework of high degree of polymerization. The revealed liquation structure of the frit consists of two glass phases: the more easily low-melting matrix contains drop-like inhomogeneities distributed in it enriched of SiO2 which explains the steadiness and stability of the glass at operating temperatures.
The natural minerals of the Tebinbulak deposit, which are used as a thermal insulation material, have been studied, while their swelling coefficient depends on the size of the raw material and ranges from 3.47 to 7.67. The structure of the material has been studied by X-ray diffraction and infrared spectroscopy. The chemical composition has been determined by the microprobe method, and phase transformations during heating by differential scanning calorimetry. The obtained-information allowed us to conclude that this micaceousmineralis at the initial stage of metamorphism: disordered interlayer structure of phlogopite/vermiculite (hydrophlogopite). The information is important when discussing the influence of the structure of hydrosludes on the possibility and nature of their swelling during heating.
New glassy materials have been obtained in the ZnO–B2O3:CоO system. The physicochemical and spectral properties of zinc-borate glasses doped with cobalt have been studied in the composition range from 45 to 70 mas. % ZnO.
The influence of the glass matrix on the coordination state of Co2+ ions is shown. Intense absorption bands in the visible region are attributed to the 4A2(F) ? 2A1(G), 4A2(F) ? 4T1(P) and 4A2(F) ? 2E(2G) transitions. The presence of an absorption band in the near-IR region (1.3 – 1.7 µm) due to the electronic transition 4A2(4F) ? 4T1(4F) of cobalt in the tetracoordinated state has been established.
A method has been developed to eliminate gaps between glass plates during thermal bonding using a system for distributing the mechanical load. Theoretical and experimental studies of the proposed method have been carried out. The results of numerical and full-scale experiments are presented, confirming the effectiveness of the proposed method.
An energy-saving technology for decorating glass products with foaming paints has been developed. The optimal parameters of coating firing by the flow of plasma–forming gas – argon are determined. The influence of sodium liquid glass on the quality of decorative coating is investigated.
The paper presents the results of studies of the algicidal and bactericidal properties of copper-containing glassy phosphate composition (MSFC). It has been established that the presence of MSFC in aqueous solutions inhibits the processes of bacterial reproduction, water bloom in them due to the fact that the protective phosphate film formed not only on the surface of heating elements, but also on the surface of the water microflora does not lose its continuity due to the partial hydrolysis of the readily soluble sodium components of the composition, and prevents the access of oxygen to the microflora of water and aqueous solutions and copper cations lead to the suppression of the vital activity of biological pollutants. MSFC can be recommended for the treatment of water for any purpose related to water use.
It was found that almost all the studied compounds could be carbonized under the influence of dry or wet carbon dioxide with the formation of calcium or magnesium carbonates. The equilibrium partial pressure of carbon dioxide or the equilibrium activity of the carbonate ion methods were used to evaluate carbonation reactions possibility. The activity of some minerals in carbonation reactions significantly exceeds the activity of the wollastonite and rankinite , which are used in Solidia?s clinker technolohy.
